#banner {
    width: 500px;
    height: 350px;
    display: block;
    margin: 0 auto;
    overflow: hidden;
}
#banner .banner_img {
    width: 900px;
    height: 350px;
    display: block;
    margin: 0;
    padding: 0;
}
#banner .banner_img li {
    width: 500px;
    height: 350px;
    float: left;
    list-style: none;
    margin: 0;
    padding: 0;
}
#banner .banner_img img {
    width: 500px;
    height: 350px;
}
 .banner_item {
    width: 400px;
    height: 10px;
    display: block;
    margin:  20px auto;
    padding: 0;
    z-index: 222;
}
 .banner_item li {
    width: 5px;
    height: 5px;
    border-radius: 25px;
    float: left;
    display: inline-block;
    margin-right: 10px;
    background-color: #0a8ddf;
}
